This 5.1 MHz circuit was found in a 1980s documentation. The frequency is given by the crystal and general purpose transistors can be used.
) Found in a 90s Linear Technology documentation, this circuit is a fading of video signals and...
This tuning-free circuit was found in an old operating amplifier manual. The setting can serve as...
This circuit was found in the Spanish magazine that no more existis Mundo Electrónico, in a...